Collapsible tap



W. H. GATES. COLLAPSIBLE TAP.

APPLlcAxoN FILED JuLY 26.1919.

Patented Nov. 9, 1920.

2 SHEETS-SHEET I.

W. H. GATES.

COLLAPSIBLE TAP.

APPLICATION FILED JULY 26,1919.

1,358,075. l Patented No... 9,1920.

2 SHEETSvSHEET 2.

:za i

3 9' Ll IJ .NVENTOR WILLIAM II. GATES, or NEW HAvEN, CONNECTICUT.

COLLAPSIBLE T AP.

speciecation of Letters Patent; V`Patented Nov. 9, 1920.

Application led July 26, 1919. Serial No. 313,510.

To @ZZ 'LU/wm t may concern.' l

Be it known that I, VILLIAM GATES, citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Collapsible Taps; and I do hereby declare they followingV to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains, to make and use the same.

My invention relates to taps of the collapsible type, and is an improvement on the patent granted to me on December 19, 1916, y

No. 1,209,139, and it consists in certain details of construction to be more fully set forth in the following specication.

Referring to `the accompanying drawings wherein the same igures and letters of reference indicate like parts throughout the several views, Y

Figure 1 represents a front elevation of i the tap Fig. 2 is a sectional View of the trip shell, showing the threading dies expanded with. the die plate that covers the endsI of the dies removed; p

Fig. 3 is a broken detail view of the body of the tap with the threading dies removed;

Fig. 4 is a detail view of the central part of the tap showing the threading dies and die plate removed; l

Fig. 5 is a broken view partly in section of thc tap showing the cam rod carrying shell in locked position with the-threading dies removed;

Fig. 6 in an interior view of the cam `rod shell and sectional view of the shank of the taps Fig. 'T is a similar view of the cam rod shell and an ladditional broken'view of the cam rods with the shell engaged therewith g' Fig. 8 is a broken view" of the tap body and sectional view of the trip shell shot/ving the cam rod actuating shell in locked position;

Fig. v9 is a broken view partly in section, and a cross sectional view of the adjustable locking bolt and trip rod; I

Fig. 10 is a detail arrangement of the Vgroup of elements comprisingthe locking and tripping mechanism;

Y Fig. 11 is a side elevation of the cani rod shell and broken view of the shank of the tap;

Fig. 12 is a central sectional view ,of the cam rod shell and broken view of threeV of the cam rods engaged therewith;

Fig. 13 is a detail threading dies;

Fig. 141 is a detail view of one of the cam rods g' and l Fig. 15 is a broken view of a stop located in rearof the tap.

The body of the tap, F ig. 3, comprises the end 1 in whichare the radial slots "2-see also Figs. 2 and 4:*for the threading dies 3, conimon to taps of this' type. The part 4L of the body is adapted to support the sliding trip shell 5. AThe part 5a of the body supports the sliding shell 6, and the shank 7 is adapte-d to enter a movable turret head-not shown. As in my former patent, the threading dies have cam grooves 8, Fig. 14, and the cam rods 9 have the cam Vprojections 9a engaging therewith to open and close the threading dies. These cam rods have` a longitudinal movement in the holes 10, Fig. 4, of the body terminating in the semi-circular recess 11, Figs. 3 and 6 of the shank.

The shell 6 has the central opening or bore 14, F ig. 12, and is thus slidablymounted on the shank 7 as well as on the part 5@L of the tap body. 15 are semicircular recesses formed in the flange 16 of the shell adapted to register with the semi-circular recesses 11 in the shank 7. The shell 6 is iirst slid along the shank until its semi-circular recessesl embrace the cam rods as showny in Fig. 6, then-the shell is rotated-see arrow a-to engageits flange 16, Figs. 7 and 12, with the notches 17 of the cainrods, and place said rods under thecontrol of the shelLQThis arrangement not only enables the shell itselfto engage and actuate the cam rods, instead of employing an eXtra member for that purview of one of th Y pose, as in my former patent, but there is no requirement for an accurate location of the shell with respect to the cam rods as was formerly the case. As soon as the flange 16 enters the notches of the cam rods, the shell is rotated until the opening 18, Figs. 6 and 7, is brought in alinement with the loCklgbolt 19,-Fig. 3. The opening 18 may be considerably larger than the bolt, as it Asimply serves as a clearance for the same.

ln tact, the shell has a lateral adjustment capable or lts being located at any point bettveeli its senil-circular recesses l5.

rlhe locking bolt, Figs. 3, 8 and l0, has the notch 2() adapted to interlock With'the trip the tap to receive the slide members 2id-Wfse'e also Figs; 2 and -ba'clred up by the springs 28. 'lhe slide 26 carries the trip pin 29, located in thehole 30, Fig. fl, and is adapted to lift the trip llever 2l out ci its engagement with the locking bolt 19. rlfhe slide 27 carries `no trip pin but serves as Va steadying 'feature or balance for the trip shell 5. rl`his shell embraces the part l oit the tap body and also a portion oli the cam rod carrying shell 6. 3l are elongated recesses in the periphery of the shell 5 toadl mit the body oit the bolts 32 adapted to engage the members 26e-27, and secure them to the interior'ol the shell when the position Yoi said shell is properly located with respect Cri to the depth ola hole to be tapped.

` Theoperation ot the tap is as lollovvs: Ai-

terthe trip shell has been properlyV adjusted and the .members 262l secured there-- to', the threading dies are engaged, and when 'thepredetermined depth ol thread is reached.,

the end of the trip shell 5 will Contact th the piece tapped-not shoivn-and be iiorced back and cause the pointedv t ip pin to lift theV trip lever 2l 'from itscontact with the locking bolt, and, when thus released, the springs 33 `will torce the rod carryingshelldbaclr lar enough to draiv the threading dies inward and thus release the thread cutting operation. The hole SOYin the shell 6 serves as a clearance for the trip pin 29. Any Well known means may be employed to reloclr the shell 6. ln 8, the handle 34 may be used lor manually advancing the shell, or the stop-35, sheet 1 may be adjustably supported on a part of the machine-not shownso thativhen the tap isdrawn back it vvillengage the shell 6 therewith, and said shell will be forced tor- Ward'and reloolred.

y SGVare pins, Fig. 5, carried by. the members S26-2 7, and 37 are recesses formed in the tap body into Which the pills project to pre- VYvent the said members dropping out when released fromk their forcibleengagement With the trip shell 5. 38ll`ig. ll, is ascreW in the shell 6 adapted to engage the recesses 89 in the shank '7 which serves to maintain the shell in operative position. 1 The several improved features, above enumerated, not only add greatly to the servicerods, to be inaccurate Valinement with the rods to avoid cramping.` ln the present arrangement, the rods are detachably connected to the shell and interlock therewith "in such a manner as to leave the shell per- Y ect freedom of adjustment With respect to its relative position with other elements ot the l construction. Y p

Having thus described'my invention, what .l claimis: Y

Y l. A collapsible tap comprising a body carrying threading dies, cam rods for actuating the dies, a shell mounted to slide on the body and engage the cam rods to actuate the same, a .trip lever carriedbythe shell, a trip shell mounted toslide on the body, an adjustable locking bolt in the body adapted tobe engaged by the trip lever, said trip shell adapted 'to be set to regulate the tapking depth and disengage the tripl lever lrom the locking bolt.

2. A collapsibleV tap comprisingV a body carrying threading vdie's,'cain rods 'jl-or actuating the dies,'a shellmounted on the body and eno'aoin the cam rods to-actuate the same`,`a trip lever carried by theV shell, an adjustable locking boltin the body adapted to be engaged by thev trip lever, a trip s -ell mounted to slide on the body, said body having recesses, slide members mounted therein, I

a trip pin carried by one o-saidv members, and means to secure the Vtrip shell to said members. and position the same with` respect to the predetermined depth to be tapped'.

3. A. tapbody having recesses.' therein,

springV actuated slide members 'mounted therein, a trip pin carried one olc said members, atrip shell mountedto slide on the body and adapted'toV be adjusted thereon,

and means for securing saidshell to the slide members .in any oi its adjusted positions. -V

- 4. A collapsible taphaving a body, radially operating threading dies mounted therein, cam rods, and a movable shell having an internal flange adapted to interlock With the cam rods and actuate said rods to open ,and close the threading dies.v

5. A collapsible tap comprising abody having a shank, radially operating threading dies, mounted'inthe body, cam rods adapted to engage therewith, said body having openings therein for the reception of the cam rods, said shank havingl grooves therein registering With said openings, and,

a movable shell having lan internal flange adapted to interloclrivith the cam rods and actuate said rods to open and closethe dies;

@35eme 3 6. A collapsible tap having a body with a adapted to register with the grooves of the projecting` shank, radially operating threaclshank and embrace the Cain rods, said shell l0 ing dies, earn rods adapted to engage thereadapted to engage the notches of the Cam with, said body having openings therein for rod and interlock therewith to aetuate said the reception of the cam rods, said rods rods to open and close the dies. having notches therein, said shank having In testimony whereof I affix my signature. grooves therein registering With the Cam rod openings, and a movable shell having grooves VILLIAM H. GATES. 

